Creates and returns a new authentication token for the currently authenticated User
AI agents use create_auth_token to create or update resources in Vercel MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Vercel MCP Server environment.
Creating an authentication token is a write operation that generates a new credential. However, the severity is elevated to 'high' because a misused token grants the bearer broad Vercel API access (deployment, domain, environment variable management evident from sibling tools), creating significant blast radius if an AI agent generates and exfiltrates tokens without authorization.
From the tool's definition Tool description states it 'Creates and returns a new authentication token' — this is a create operation that generates a credential artifact. The action is reversible (tokens can be revoked), distinguishing it from destructive operations.
Documented attack patterns abuse exactly the kind of access create_auth_token gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Vercel MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for create_auth_token:
{
"version": "1",
"default": "deny",
"tools": {
"create_auth_token": {
"limits": [
{
"counter": "create_auth_token_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}create_auth_token stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Creates and returns a new authentication token for the currently authenticated User. It is categorised as a Write tool in the Vercel MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Vercel MCP Server MCP server in PolicyLayer and add a rule for create_auth_token: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Vercel MCP Server. Nothing to install.
create_auth_token is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the create_auth_token rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for create_auth_token. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
create_auth_token is provided by the Vercel MCP Server MCP server (quegenx/vercel-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 154 Vercel MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
154 Vercel MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.